By installing too many games? I don't mean numbers of games, I mean when I get a new game, I always try Crossover Games first, then move to other options if it doesn't work. I assume that the things that those games installed are still hanging around cluttering up the install, possibly causing confusion for other games?
Here's why I think this might be an issue and what I did. I used to have a C2D iMac, which I passed on to my son, who is using Crossover Games on his account, which is a fresh install with only 4 games installed. We were going to play Titan Quest together over LAN. I tried to get the (LAN or internet) game started from my machine, an i7 iMac, and it would crash. Go upstairs and start it (only tried internet, not LAN on his machine) on his, and it works fine. (There was another issue, I was able to use the keyboard to create a player via my machine, but only on regular TQ, not Immortal Throne, and it had other weird keystroke issues, but...)
I tried to get it to start via Parallels and the same thing, the game would crash. Looking around, my Programs menu in Crossover was littered with GFWL, Physics engines, sound engines, etc, so I decided I'd wipe everything that wasn't Mac off this machine and start over. I am still downloading things, and it may have been a stupid thing to do, but I got hit by a truck last year, I've got time :)
My question is was my line of thinking correct? I should be able to at least verify my question once these things re-install, but is there an easier way to do this? As far as the game installs, I had just re-downloaded both TQ and the expansion, Immortal Throne 2 days ago to get ready to play with him, so I'm confident the game install was fine, I could play a Single Player game fine.